PHP缓存类PHP-Cache-Kit

1. 
   
2. <?php
   
3. // PHP-Cache-Kit is an example of how to add modular caching to your PHP projects
   
4. // It is free for all use, but please do not re-distribute without this header.
   
5. // Most recent version available from [url]http://acme-web-design.info/php-cache-kit.html[/url]
   
6. // Send suggestions to [email]info@acme-web-design.info[/email]
   
7. 
   
8. 
   
9. /*
   
10.   // uses two global configuration variables: cache_active, cache_folder
    
11. 
    
12.   // To use: set cache_active = true, assign cache_folder
    
13.   // Next, call acmeCache::fetch instead of generating a page or module.
    
14.   // Only if it returns false, build the section then call acmeCache::save.
    
15. 
    
16.   // You only need these two functions and you do not need to
    
17.   // create an object -- the class wrapping is just to avoid namespace
    
18.   // conflicts with your existing code.
    
19. 
    
20.   // Usage example:
    
21. 
    
22.   // Do this stuff in your config file
    
23.   include_once(\'cache-kit.php\');
    
24.   $cache_active = true;
    
25.   $cache_folder = \'cache/\';
    
26. 
    
27.   // Now you can convert any time-consuming but rarely-changing data module into
    
28.   // a fast cached module. This example rebuilds the calendar only every 5 minutes.
    
29.   function helloWorld(){
    
30.    $result = acmeCache::fetch(\'helloWorld\', 10); // 10 seconds
    
31.    if(!$result){
    
32.     $result = \'<h2> Hello world</h2> <p>Build time: \'.date("F j, Y, g:i a").\'</p>\';
    
33.     acmeCache::save(\'helloWorld\', $result);
    
34.    } else echo(\'Cached result<br/>\');
    
35.    return $result;
    
36.   }
    
37. 
    
38.   // now use the content module function just like you normally would -- caching is automatic!
    
39.   echo(helloWorld());
    
40. 
    
41. */
    
42. 
    
43. 
    
44. class acmeCache{
    
45. 
    
46. // public functionality, acmeCache::fetch() and acmeCache::save()
    
47. // =========================
    
48. 
    
49. function fetch($name, $refreshSeconds = 0){
    
50.   if(!$GLOBALS[\'cache_active\']) return false;
    
51.   if(!$refreshSeconds) $refreshSeconds = 60;
    
52.   $cacheFile = acmeCache::cachePath($name);
    
53.   if(file_exists($cacheFile) and
    
54.    ((time()-filemtime($cacheFile))< $refreshSeconds))
    
55.    $cacheContent = file_get_contents($cacheFile);
    
56.   return $cacheContent;
    
57. }
    
58. 
    
59. function save($name, $cacheContent){
    
60.   if(!$GLOBALS[\'cache_active\']) return;
    
61.   $cacheFile = acmeCache::cachePath($name);
    
62.   acmeCache::savetofile($cacheFile, $cacheContent);
    
63. }
    
64. 
    
65. // for internal use
    
66. // ====================
    
67. function cachePath($name){
    
68.   $cacheFolder = $GLOBALS[\'cache_folder\'];
    
69.   if(!$cacheFolder) $cacheFolder = trim($_SERVER[\'DOCUMENT_ROOT\'],\'/\').\'/cache/\';
    
70.   return $cacheFolder . md5(strtolower(trim($name))) . \'.cache\';
    
71. }
    
72. 
    
73. function savetofile($filename, $data){
    
74.   $dir = trim(dirname($filename),\'/\').\'/\';
    
75.   acmeCache::forceDirectory($dir);
    
76.   $file = fopen($filename, \'w\');
    
77.   fwrite($file, $data); fclose($file);
    
78. }
    
79. 
    
80. function forceDirectory($dir){ // force directory structure
    
81.   return is_dir($dir) or (acmeCache::forceDirectory(dirname($dir)) and mkdir($dir, 0777));
    
82. }
    
83. 
    
84. }
    
85. ?>[/php]示例：[php]<?php
    
86. 
    
87.   // Usage example:
    
88. 
    
89.   // Do this stuff in your config file
    
90.   include_once(\'cache-kit.php\');
    
91.   $cache_active = true;
    
92.   $cache_folder = \'cache/\';
    
93. 
    
94.   // Now you can convert any time-consuming but rarely-changing data module into
    
95.   // a fast cached module. This example rebuilds the calendar only every 5 minutes.
    
96.   function helloWorld(){
    
97.    $result = acmeCache::fetch(\'helloWorld\', 10); // 10 seconds
    
98.    if(!$result){
    
99.     $result = \'<h2> Hello world</h2> <p>Build time: \'.date("F j, Y, g:i a").\'</p>\';
    
100.     acmeCache::save(\'helloWorld\', $result);
     
101.    } else echo(\'Cached result<br/>\');
     
102.    return $result;
     
103.   }
     
104. 
     
105.   // now use the content module function just like you normally would -- caching is automatic!
     
106.   echo(helloWorld());
     
107. 
     
108. ?>

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